CFD simulation on the transient process of coolant mixing phenomenon in reactor pressure vessel

Li, Jun; Wang, Mingjun; Fang, Di; Wang, Jie; Liu, Dong; Tian, Wenxi; Qiu, Suizheng; Su, G.H.

doi:10.1016/j.anucene.2020.108045

Cited by 11 publications

(2 citation statements)

References 18 publications

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“…In this paper, five different grid numbers were established for the independent grid study [ 20 ], and the number of cells was 371 thousand, 518 thousand, 619 thousand, 822 thousand and 1.025 million, respectively. The initial attributes of each parameter were as follows: the pressure was set as standard atmospheric pressure; temperature 290 K; the ambient air inlet and fuel inlet were 4 m/s.…”

Section: Establishment Of the Modelmentioning

confidence: 99%

Simulation on Heat Transfer and Emergency Protection of Tanks in a Tank Farm under Fire Scenario

Bao

Zhang

Cheng

et al. 2023

IJERPH

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It is very important to understand the heat transfer process between storage tanks in a tank farm under a fire scenario, which is one of the key factors in determining the consequences of accident development. In this paper, a CFD simulation is used to study the heat transfer process and emergency protection of tanks under a fire scenario. The simulated results show that the changes in wind speed can affect the heat transfer of the tank farm. The highest temperature of the tanks at 5.3 m/s (wind speed) is 1432 K, while the highest temperature at 17.1 m/s (wind speed) is 1556 K. At the same time, the changes in wind direction can also affect the heat transfer of the tank farm. For the 45° east by north (wind direction), almost all tanks in the tank farm are affected by the fire. When the water curtain was applied as an emergency protection measure, the simulated highest temperature of the tanks decreased to 779 K (the cooling water intensity 6 L/min·m2), while the highest temperature of the tanks was 1432 K without water curtain protection under the actual fire conditions. The simulated highest temperature of the tanks decreased to 671 K when the emergency thermal insulation coating was sprayed on the surface of the tanks, which can effectively protect the adjacent tanks from being destroyed.

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Section: Establishment Of the Modelmentioning

confidence: 99%

Simulation on Heat Transfer and Emergency Protection of Tanks in a Tank Farm under Fire Scenario

Bao

Zhang

Cheng

et al. 2023

IJERPH

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“…The PTS in pressurized nuclear reactors have been the subject of plentiful numerical studies employing various approaches, such as a coupling of multiple RANS models (standard k-, realizable k-and Reynolds-Stress models) (Hu et al 2020), a two-phase CFD model including the effect of free-surface condensation (Cremer et al 2019), a Direct Numerical Simulation (DNS) of 1 3 the flow and thermal fields with a discussion on the validity of the Boussinesq hypothesis (Shams et al 2019). Moreover, the mixing process in nuclear reactor downcomers have been recently experimentally and numerically analyzed using RANS turbulence models (Eltayeb et al 2021), or Large Eddy Simulation (LES) (Chouhan et al 2021) with sensitivity to the coolant injection rate (Li et al 2021). CFD is also used to evaluate the risk of crack initiation and propagation in a reactor pressure vessel (Uitslag-Doolaard et al 2020;Ruan and Morishita 2021).…”

Section: Introductionmentioning

confidence: 99%

Wall-Resolved Large Eddy Simulations of the Transient Turbulent Fluid Mixing in a Closed System Replicating a Pressurized Thermal Shock

Angeli

2021

Flow Turbulence Combust

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The isothermal mixing of a heavy and a light liquid of different physical properties is numerically investigated by means of Large Eddy Simulations. The validation is based on experimental data held in a system reproducing various components of a pressurized water nuclear reactor, during a scenario of cold water injection at a low Atwood number of 0.05. The flow has two distinct stages: first a buoyancy-driven phase is characterized by a fluid front development in the cold leg and gives rise to Kelvin-Helmholtz whorls under the action of density changes. Then, the heavy liquid discharges into the downcomer filled with light liquid, which causes a turbulent mixing. These phenomena are analyzed through a single-phase approach where the density of the working fluid is either variable or modeled by the Boussinesq approximation. The influence of grid refinement is deeply examined, which shows that the mesh convergence is well achieved for the main flow quantities, unlike the low-magnitude spanwise components. Overall, the numerical solutions are found to reproduce the experimental measurements with a fair accuracy for both physical models used. These latter exhibit similar trends, due to the small density difference under consideration. The predictions in the downcomer appear to be more challenging owing to a strongest turbulence than in the cold leg, some flow features being not properly captured. However, the experimental data in the downcomer are found to be incomplete and somewhat dubious for a strict validation of the numerical simulations. Lastly, the flow distribution in the dowcomer is investigated, providing further insight on the mixing process.

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Numerical simulation of coupling heat transfer and thermal stress for spent fuel dry storage cask with different power distribution and tilt angles

Cheng

Tao

et al. 2023

NUCL SCI TECH

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CFD simulation on the transient process of coolant mixing phenomenon in reactor pressure vessel

Cited by 11 publications

References 18 publications

Simulation on Heat Transfer and Emergency Protection of Tanks in a Tank Farm under Fire Scenario

Simulation on Heat Transfer and Emergency Protection of Tanks in a Tank Farm under Fire Scenario

Wall-Resolved Large Eddy Simulations of the Transient Turbulent Fluid Mixing in a Closed System Replicating a Pressurized Thermal Shock

Numerical simulation of coupling heat transfer and thermal stress for spent fuel dry storage cask with different power distribution and tilt angles

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